194 
Journal of Agricultural Research 
Vol. XXXI, No. 2 
Table V. —Comparison of age and bacterial count of sterilizing solution taken 
from long milk tubes , with bacterial count of the milk . (During cold weather) 
Chloride of lime 
Milk 
Age of solution, in the number 
of the milking for which used 
Number 
of sam¬ 
ples 
Range in 
bacterial 
count 
Average 
bacterial 
count 
per c. c. 
Number 
of sam¬ 
ples 
Range in bac¬ 
terial count 
Average 
bacterial 
count 
per c. c. 
First__ 
2 
0 
0 
6 
1.700 to 25,000 
1,600 to 10,200 
1.100 to 12,000 
900 to 11,000 
2.700 to 13,300 
2.100 to 9,800 
2,200 to 14,000 
1,400 to 11,400 
1.100 to 8,400 
2,500 to 11,000 
9,430 
3,730 
4,840 
4,670 
5,360 
5,070 
4,330 
4,710 
4,970 
5,410 
Second_ 
4 
0 to 3 
2 
12 
Third_ 
3 
0 to 4 
2 
9 
Fourth_ 
4 
0 to 4 
1 
12 
Fifth_i_ 
5 
0 to 1 
1 
15 
Sixth_ 
2 
OtO 1 
1 
6 
Seventh__ 
3 
0 to 2 
1 
9 
Eighth ___ 
7 
0 to 300 
44 
21 
Ninth_ 
4 
Oto 10 
3 
12 
Tenth_ _ 
3 
1 to 20 
7 
9 
Salt and chloride of lime solution 
Milk 
First..... 
3 
Oto 3 
1 
8 
1,200 to 3,900 
800 to 6,800 
1,200 to 12,500 
1,000 to 11,000 
1,600 to 12,000 
1,100 to 9,100 
1,600 to 20,000 
1,400 to 12,600 
1,800 to 12,800 
1,500 to 8,800 
2,800 
3.500 
4,940 
4,280 
4,950 
5,870 
5,340 
5,880 
5,480 
4.500 
Second_ 
3 
0 
0 
9 
Third_ 
3 
Oto 7 
3 
11 
Fourth _ 
4 
1 to 4 
3 
12 
Fifth..... 
6 
Oto 400 
69 
18 
Sixth.... 
3 
Oto 3 
1 
9 
Seventh _ _ 
4 
Oto 8 
3 
12 
Eighth.._ 
6 
Oto 250 
63 
18 
Ninth.... 
4 
Oto 440 
116 
12 
Tenth_ 
2 
Oto 40 
20 
6 
Table VI .—Comparison of age and bacterial count of sterilizing solution taken 
from long milk tubes , with bacterial count of the milk. (During warm weather) 
Chloride of lime solution 
Milk 
Age of solution, in the number 
of the milking for which used 
Number 
of sam¬ 
ples 
Range in 
bacterial 
count 
Average 
bacterial 
count 
per c. c. 
Number 
of sam¬ 
ples 
Range in bac¬ 
terial count 
Average 
bacteria 
count 
per c. c. 
First. 
5 
Oto 200 
44 
15 
2,700 to 19,300 
8,410 
Second-... 
7 
1 to20 
5 
21 
4,200 to 42,000 
11,840 
Third.... 
7 
1 to 5,000 
859 
21 
3,800 to 63,000 
14,540 
Fourth-. 
7 
2 to 48,000 
11,004 
21 
3,400 to 160,000 
23,970 
Fifth... 
5 
20 to 10,000 
2,286 
15 
5,300 to 128,000 
24,870 
Salt and chloride of lime solution 
Milk 
First. 
6 
Oto 12 
4 
18 
2,500 to 9,400 
4,630 
Second. 
7 
1 to 30 
10 
21 
2,100 to 24,400 
7,970 
Third... 
7 
Oto 180 
37 
21 
3,100 to 36,000 
9,350 
Fourth... 
7 
1 to 1,440 
433 
21 
3,500 to 45,000 
11,030 
Fifth... 
5 
10 to 720 
215 
15 
3,100 to 28,000 
10,460 
SUMMARY AND CONCLUSIONS 
Comparative tests of the three methods commonly used for steriliz¬ 
ing milidng machines—namely, heat, chloride of lime, and a mixture of 
common salt and chloride of lime—showed that the heat method, 
under conditions as nearly identical as possible, gave more uniform 
and appreciably lower bacterial counts than did the other two 
methods. 
